I think there's a number of factors with car prices at the moment the chip shortage which is world wide the world health due to Covid, plus with Electric cars moving ever forward
Used car prices are only on the up
Pretty much all round.
Weather the bubble will burst, I think with 350z well kept will never loose to much and been mention before with GT4 edition as Ltd always expect a premium weather they will steady or keep going up Iam not to sure, Personally I wouldn't pay these amounts but each to there own as they say Ha ha